ON THE ACTION OF LIGHT UPON DYED COLOURS. 265 



Trij^henylmethan Colour. 



WoilBook V. ^,. ^ , 



Acid Colour. 20. Bcngaline PH extra. Constitution not published. 



Azo Colotirs. 

 Direct Cotton 4. Rosaziirin B. From o-tolidine and methyl-jS-naphthylamine-sul- 

 Colours. phonic acid S. S. and J. l'J9. 



14. Naphthylene Red. From 1.5-diamido-naphthalene and naphthi- 



onic acid. S. and J. 147. 



15. Rosazurin G. From o-tolidine, methyl-;3-naplithylamine-sulpho- 



nic acid 5, and /3-naphthylamine-sulphonic acid S. S. and J, 



198. 

 4G. Terra Cctta F. From primuline and ^>sulpho-naphthalene-azo- 

 «i-phenylene-diamine. 

 Developed Colour. 1. Primuline Red. From primuline and 0-nnphtliol. 



Natural Colouring Matters. 

 Wool Book VI. 



Non-mordant Colour. 1. Orchil. From Roccella tinctoria 

 Mordant Colours. 7. Barwood (Al.). Wood of Baphia nitida. 



8. Sanderswood (AL). Wood of Pterocarpus santalinus. 



Notes.— Rosazurin B and G become yellower during the fading process, 

 a change which is still more pronounced in the case of Naphthylene Red. 

 The Barwood and Sanderswood reds become brown during the first fading 

 period, and then rapidly fade to a pale drab, and finally, at the end of a 

 year, to a buff colour. 



Class II. Fugitive Colours. (Wool.) 



The colours of this class show very marked fading at the end of the 

 second 'fading period ' (July 14 to August 20, 1894), and after a year's 

 exposure they have entirely faded, or only a tint remains. 



Azo Colours. 



Azo Orchil R. Constitution not published. 

 Fast Acid Magenta. Constitution not published. 

 Emin Red. Constitution not published. 

 Azo Cardinal G. Constitution not published. 

 Brilliant Geranine B. Constitution not published. 

 Colours. 2. Brilliant Geranine 3B. Constitution not published. 

 „ 3. Congo Rubin. Constitution not published. 



„ 5. Titan Red. Constitution not published. 



„ 9. Benzopurpurin lOB. From dianisidine and naphthionic acid, 



S. and J. 214. 

 „ 11. Hessian Purple N. From diamido-stilbene-disulphonic acid and 



/3-naphthylamine. S. and J. 150. 

 13. Diamine Red NO. From ethoxy-benzidine, /3-naphthylamine- 

 ;8-sulphonic acid and ^-naphthylamine-5-sulphonic acid. S. and 

 J. 203. 

 „ 18. Hessian Purple B. From diamido-stilbene-disulphonic acid and 



3-naphthylamine-sulphonic acid (j3 and S). S. and J. 152. 

 „ 19. Hessian Brilhant Purple. From diamido-stilbene-disulphonic acid 



and ^-naphthy)amine-/8-sulphonic acid. S. and J. 151. 

 „ 20. Hessian Purple D. From diamido-stilbene-disulphonic acid and 



(8-naphthylamine-mono-sulphonic acid 7. S. and J. 153. 

 „ 21. Benzo Fast Red. Constitution not published. 



„ 22. Titan Scarlet C. Constitution not published. 



„ 24. Benzopurpurin 6B. From tolidine and a-naphthylamine-mono- 



sulphonic acid L. S. and J. 190. 



